3.11.6. Upgrading a Customized or Extended Bugzilla
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If your Bugzilla has been customized or uses extensions, you will need
to make your customizations or extensions work with your new version
of Bugzilla. If this is the case, you are particularly strongly
recommended to do a test upgrade on a test system and use that to help
you port forward your customizations.

If your extension came from a third party, look to see if an updated
version is available for the version of Bugzilla you are upgrading to.
If not, and you want to continue using it, you'll need to port it
forward yourself.

If you are upgrading from a version of Bugzilla earlier than 3.6 and
have extensions for which a newer version is not available from an
upstream source, then you need to convert them. This is because the
extension format changed in version 3.6. There is a file called
"extension-convert.pl" in the "contrib" directory which may be able to
help you with that.

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This documentation undoubtedly has bugs; if you find some, please file
them here.
